JROK Williams Multi losing settings

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Finally installed this JROK into the multi-wiliams cab, and got it all configured.

I turned it on this morning, and it threw an error message on the screen. Something about
NVRAM Checksum invalid, defaults restored.

It looks like the game settings are all still correct, but all the JROK settings are gone (the menu has put all the games back on the list, etc).

Has anyone seen this before?
 
Finally installed this JROK into the multi-wiliams cab, and got it all configured.

I turned it on this morning, and it threw an error message on the screen. Something about
NVRAM Checksum invalid, defaults restored.

It looks like the game settings are all still correct, but all the JROK settings are gone (the menu has put all the games back on the list, etc).

Has anyone seen this before?

What version of the board is it ? Does it happen every time you power the board off ?

I'd start with just checking the voltage at the board, make sure it's right around 5v.
 
What version of the board is it ? Does it happen every time you power the board off ?

I'd start with just checking the voltage at the board, make sure it's right around 5v.

Menu v1.05
FPGA v1.06
MCU v1.04R
CPU 6809

It doesn't happen every time. And I haven't noticed a pattern (like where the menu was when it was powered off).

Voltage is 5.01(ish).

IMG_9421.jpeg
 
Last edited:
Bumping this, as I may need more help.
Has anyone replaced the NVRam on a JROK PCB before? Best guess is that I need to replace IC2.

I can do the soldering, I just don't know what chip to order.
 
I wonder if the 5 volts is level and steady.
New Happ power supply that appears to be steady between 5.0-5.02v... Unless it's fluctuating while my back is turned, it seems pretty solid.
 
Fwiw, we've discussed it in other threads, but the Jrok seems to be especially sensitive to voltage. You really want it right at 5.00V. People have had issues at even 5.05.

Not that it sounds like your particular issue in this case. But just FYI.
 
Okay, I'll try something useful. Try reloading the games from the USB port? Verify FG(Field Ground) on the Happ supply is connected to earth. These devices can be sensitive to spikes/surges and a ground loop or inrush could possibly corrupt data. Could also try shielding (coffee can for a week and see if it acts up) Running a CRT, or LCD (I see the VGA connected)? Make sure monitor is grounded too, degauss field on CRT if too close (mount further away).

These units are typically very solid, so your initial thought on the Part failing is very possible too.

Sorry for the bracket post, but I've had people ask for help on these where they were hanging in the cab by the JAMMA harness, or laying on a metal coin bucket.

~Brad
 
As seen in post #4, it is not dangling or laying on metal.
Field Grounds are connected proper to both PS & CRT.
I don't see coffee can attachments on your bracket... I'll just leave that suggestion alone.

FWIW, @jrok mentioned wanting to look at it, and said that it was pretty difficult to lose these settings. We just haven't been able to connect, yet.

"I'd really like to know what's going on with it, if you want to send me the board I'd repair or replace because losing the settings is REALLY hard, you'd have to be in the system settings menu, change a value and before it saves reset the machine, which by the time you see the changed setting on screen it's already saved. You could possibly get it to corrupt the settings, but having it do that repeatedly seems like a bigger issue ( possibly failing NVRAM )."
 
New Happ power supply that appears to be steady between 5.0-5.02v... Unless it's fluctuating while my back is turned, it seems pretty solid.
Speculation and assumptions isn't the same as checking with a decent scope.

If after the chip has been replaced and if the pcb still has the same issues. I recommend looking at the "new" powersupply.

I wonder if the pcb has a heavy enough load for the switcher to work properly.

Just speculation here.
 
Okay, I'll try something useful. Try reloading the games from the USB port? Verify FG(Field Ground) on the Happ supply is connected to earth. These devices can be sensitive to spikes/surges and a ground loop or inrush could possibly corrupt data. Could also try shielding (coffee can for a week and see if it acts up) Running a CRT, or LCD (I see the VGA connected)? Make sure monitor is grounded too, degauss field on CRT if too close (mount further away).

These units are typically very solid, so your initial thought on the Part failing is very possible too.

Sorry for the bracket post, but I've had people ask for help on these where they were hanging in the cab by the JAMMA harness, or laying on a metal coin bucket.

~Brad
I think every game with a JROK where I work is just hanging lol

I wish I could restore them all back to original hardware

EDIT: the new logo Suzo Happ power supplies simply aren't as good as they used to be. they used to be set to 5.00V out of the box, now they're just kind of randomly thrown together.

@Hydreigon has been helping out replacing the poor caps they came with. I gave him another batch to go through.
 
The newer wSYSFPGA is still having a "NVRAM Checksum invalid, defaults restored" issue, and I've been unable to figure out the cause. Maybe the NVRAM is just bad.

I have an older v1.0 JROK Williams board that I think I'll swap in.
How do you connect these to VGA?


IMG_1731.jpg

1678689924-2249-BhAkyv.png
 
@jrok or anyone else who's done this before:

I've made a VGA cable that pulls RGB off the JAMMA connector, and H/V off the 2-pin header right next to it. I also set the jumper to VGA enable, but I'm not getting a good signal to the monitor.

The V1 board works fine over CGA.


Wayback.org doesn't appear to have archived the Gen1 manual for these boards, so I'm a bit stuck.
 
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